Activity induced isotropic-polar transition in active liquid crystals

Abstract

Active fluids are intrinsically out-of-equilibrium systems due to the internal energy injection of the active constituents. We show here that a transition from a motion-less isotropic state towards a flowing polar one can be possibly driven by the sole active injection through the action of polar-hydrodynamic interactions in absence of an ad hoc free-energy which favors the development of an ordered phase. In particular, we propose an analytical argument and we perform lattice Boltzmann simulations where the appearance of large temporal fluctuations in the polar fraction of the system is observed at the transition point. Moreover, we make use of a scale-to-scale analysis to unveil the energy transfer mechanism, proving that elastic absorption plays a relevant role in the overall dynamics of the system, contrary to what reported in previous works on the usual active gel theory where this term could be factually neglected.

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Cited by in corpus (8)

• Hydrodynamic effects on the liquid-hexatic transition of active colloids
• Giant vortex dynamics in confined active turbulence
• Helical Flow States in Active Nematics
• Active turbulence and spontaneous phase separation in inhomogeneous extensile active gels
• Phase behaviour and dynamics of three-dimensional active dumbbell systems
• Fluctuation Theorems for Heat exchanges between passive and active baths
• Quadrupolar active stress induces exotic phases of defect motion in active nematics
• Transverse Self-Propulsion Enhances the Aggregation of Active Dumbbells